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5i6

RHYNCHOCYON AND PETRODROMUS

are five fingers and toes. There is a caecum as in but few
Insectivores. The tooth formula, as revised by Thomas,1 is
I - 0 -J- Pm f- M 2 ^.3, the total number being thus forty or
forty-two. There are several species of this genus.

FIG. 250.  Wiynohocyon chrysopygus.     x J.     (After Giintber.)

and Petrodromus differ from Macroscelides in
not having such long hind-legs. The dental formula of the
first is Ii-f-a C^ Pmf Mf =34 or 36, of the latter If C 
Pm J M-|" = 40. In Petrodromus the toes are reduced to four;
in Hhynchocyon there are only four digits in the manus as well
as in the pes. This animal, as its name implies, has a longish
proboscis, which can be bent, and is really very like a miniature
Elephants trunk, and also like that of the Desman (Myogcde).
It has thirteen pairs of ribs, and a well-developed caecum. Dr.
Gunther has pointed out that in Petrodronmus tetradactylus the
hairs of the lower part of the tail are stiff elastic bristles 5 mtn.
long, with a swelling at the free tip. The use of this singular
modification is not at all apparent. PseudorhyncJiocyon, of
European Oligocene, is believed to be related to this family,
Fain. 8.  Talpidae.  -This family is confined to the Palaearetio
and Kearct/ic regions, or practically so, being fairly equally dis-
1 '-Mammals collected by Dr. Emln Pasha," in Proe. Zool. Soc. 1890, p. 446.